CVE-2026-59250 Affecting erlang package, versions <1:22.2.7+dfsg-1ubuntu0.5+esm2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2004-ERLANG-18363625
- published23 Sept 2026
- disclosed27 Jul 2026
Introduced: 27 Jul 2026
CVE-2026-59250 (opens in a new tab)How to fix?
Upgrade Ubuntu:20.04 erlang to version 1:22.2.7+dfsg-1ubuntu0.5+esm2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream erlang package and not the erlang package as distributed by Ubuntu.
See How to fix? for Ubuntu:20.04 relevant fixed versions and status.
Classic buffer overflow in the Erlang/OTP megaco flex scanner C driver allows a remote unauthenticated attacker to corrupt the driver's memory (and potentially achieve remote code execution or a denial-of-service crash) by sending a single text-encoded H.248/Megaco message containing an oversized property parm name.
When tokenizing a Local/Remote descriptor, mfs_load_property_groups extracts the attacker-controlled property name (bounded only by the message length) and, when no value follows, formats it into a fixed 512-byte error_msg field of the MfsErlDrvData struct using an unchecked sprintf call. Names longer than roughly 452 bytes overflow into the immediately following struct fields (text_buf, text_ptr, term_spec, term_spec_size, term_spec_index), overwriting live pointers and counters with attacker-chosen bytes. Subsequent scanner code writes and frees through the corrupted pointers, producing arbitrary write and arbitrary free primitives inside the BEAM VM process, which can be leveraged for remote code execution. On builds compiled with _FORTIFY_SOURCE the overflow is detected at runtime and terminates the process with SIGABRT, resulting in denial of service.
The overflow occurs in the flex scanner before any grammar or Megaco-level authentication processing, so exploitation requires only network reachability to the megaco transport port on a node configured with {scanner, flex}.
This vulnerability is associated with program files lib/megaco/src/flex/megaco_flex_scanner_drv.flex.src and program routines mfs_load_property_groups.
This issue affects OTP from OTP 17.0 before OTP 27.3.4.15, from OTP 28.0 before OTP 28.5.0.4, and from OTP 29.0 before OTP 29.0.4, corresponding to megaco from 3.17.1 before 4.7.2.2, from 4.8 before 4.8.3.1, and from 4.9 before 4.9.1. Whether OTP before OTP 17.0, corresponding to megaco before 3.17.1, is affected is unknown.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2026-59250
- https://cna.erlef.org/cves/CVE-2026-59250.html
- https://github.com/erlang/otp/commit/8704c8f550a11ed5f825e3c011ecb03565b79c4f
- https://github.com/erlang/otp/security/advisories/GHSA-7xgh-gmgf-q2g7
- https://osv.dev/vulnerability/EEF-CVE-2026-59250
- https://www.erlang.org/doc/system/versions.html#order-of-versions